package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.annotation.Annotation;
import java.lang.reflect.Method;
import java.time.LocalDateTime;

@Aspect
@Component//将切面类交给spring管理
@Slf4j
public class AutoFillAspect {
    //一。定义哪些方法需要拦截
    //匹配 com.sky.mapper 包下所有类的所有方法并且这些方法上必须有 @AutoFill 注解
    @Pointcut("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut() {
    }


    //二。拦截后执行的操作
    @Before("autoFillPointCut()")
    //JoinPoint：连接点对象，通过它可以获取目标方法的信息（如参数、方法名等）
    public void autoFill(JoinPoint joinPointcut) {
        log.info("自动填充基础字段中......");
        //获取注解参数
        MethodSignature signature = (MethodSignature)joinPointcut.getSignature();
        AutoFill autoFill =signature.getMethod().getAnnotation(AutoFill.class);
        OperationType operationType = autoFill.value();

        //获取实体对象
        Object[] args = joinPointcut.getArgs();
        if (args == null || args.length == 0) {
            return;
        }
        Object entity = args[0];

        //准备数据
        LocalDateTime now = LocalDateTime.now();
        Long currentId = BaseContext.getCurrentId();

        //根据不同类型填充（通过反射）
        if(operationType == OperationType.INSERT) {
            try {
                Method setCreateTime =entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME,LocalDateTime.class);
                Method setCreateUser =entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER,Long.class);
                Method setUpdateTime =entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME,LocalDateTime.class);
                Method setUpdateUser =entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER,Long.class);

                setCreateTime.invoke(entity,now);
                setCreateUser.invoke(entity,currentId);
                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,currentId);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }else if(operationType == OperationType.UPDATE) {
            try {
                Method setUpdateTime =entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME,LocalDateTime.class);
                Method setUpdateUser =entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER,Long.class);

                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,currentId);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}
